A new triterpene 3-beta-tiglyl-24-methylcycloartanol jointly with a mixture containing 3beta-hydroxy-urs-12-ene-28-oic and 3beta-hydroxy-olean-12-ene-28-oic acids were isolated from Almeidea coerulea. In addition to the triterpenes five alkaloids were also isolated from the same plant: 7-O-acetylhaplophyllidine, dutadrupine, isodutadrupine, 7-methoxy-8-(3,3-dimethylallyl)-dictamnine and arborinine. From A. rubra, the alkaloids arborinine, methylarborinine, evolitrine, skimmianine, kokusagine and folinine were isolated. Their structures were established based on their spectral data. The alkaloids 7-methoxy-8-(dimethylallyl)-dictamnine and 7-O-acetylhaplophyllidine are described for the first time as natural products.
Almeidea coerulea; Almeidea rubra; Rutaceae; leaves; triterpenes; alkaloids
